I started by laying the two gauge clusters and light switch out on a table and orienting everything like it would be once installed... then following the wiring diagram I wired the back of both gauges and light switch while I had easy access. Once they were wired I slid everything up into the dash and attached them... seemed easier than trying to make sure everything was correct while working under the dash...

Once the gauges and light switch were in I fed the remainder of the harness through the firewall and completed the rest of the terminations. I took my time and didn't rush and still was an easy job to finish in a weekend.


Old Truck addict
1950 chevy 1 ton napco
1956 gmc 1 ton dually napco
1954 chevy 3/4 ton napco
1957 gmc civil defense napco panel